Originally Posted by tdub2217
it doesnt help when they burst too hard, we need new magic resist items or buffs to the magic resist items we have?
we really really don't. the itemization to defend against burst is already ridiculous.
you really need two thigns to defend against AP casters. MR and HP.
playing a bruiser? build a Maw and BV. more than likely you're also building a frozen mallet and/or warmogs. so between those almost no burster can touch you. (cass is the only exception due to her sustained damage from twinfang)
Playing an AP caster? RoA+Rylai+BV.
playing a tank/support? runic, BV, and then pretty much anything with HP (shurelia, zeke's, etc.) most supports are AP. so Rylai+Runic+MR runes is generally enough to keep you health in team fights from magic damage.
TL;DR: we have a healthy number of options to defend against magic damage. we don't need more. if you dont' know what to build, build BV and a giants belt. these two items work on all champs. giants belt will build into something useful for any champion. even if you're manaless/energy BV's passive, and the fact it gives HP and MR, make it worth the investment.